Sounds like the connection between the camera and the lens is the issue. Try gently removing the lens. Be sure both camera and lens areas are free of dirt or debris. Be very careful NOT to get any dust, dirt or anything in the camera. That will cause bigger problems yet.

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Unfortunately, this probably won't be a good situation. Most of the time the ERR(or) message you're getting shows when there's an internal problem, and most likely a shutter error. Not an uncommon problem with the older consumer models like D40, D50, etc.

failure of the aperture unit is the usual cause - usually the contacts for the phase switch have come loose from the gear. You can find info on this by searching for the problem on the internet, including how to repair it.

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Err 99 could mean several different things, such as... Memory Card, Lens or Lens contacts.... Here's what you can try:Remove the memory card an enable "shooting with out memory card" and see if you still get the error. If it works your memory card is bad.Try another lens if you can. Clean the lens contacts with a pencil eraser (be careful not to get eraser dust in the camera body or in the lens). Worst case scenario is, Err 99 could be related to the shutter failing which would mean a trip to Canon. Thanks

.1. Turn off the camera.2. Remove the lens, battery, and CF card.3. Allow the camera to sit without power for approximately 20 minutes.4. Insert a fully charged battery, and turn on the camera.5. Depress the shutter button as you would to take a picture.Does the "ERR 99' message appear? If it does, then the camera should beserviced. If it does not, then please proceed to the next set of steps:1. Turn off the camera.2. Insert the CF card.3. Turn on the camera.4. Format the CF card in the camera.5. Depress the shutter button as you would to take a picture.Does the "ERR 99' message appear? If so, then the CF card is the mostlikely source of the issue. Try using a different card.If the message does not appear, please complete the following steps:1. Turn off the camera.2. Clean the lens contacts by gently rubbing them with a pencil eraseror soft cloth. Be careful that you do not let any debris fall into thecamera body.3. Reattach your lens.4. Turn on the camera.5. Depress the shutter button as you would to take a picture.If the "ERR 99' message only appears when one particular lens isattached, then that lens should be examined by a service technician.If you see the "ERR 99' with a different Canon lens attached, then thecamera should be serviced.

.1. Turn off the camera.2. Remove the lens, battery, and CF card.3. Allow the camera to sit without power for approximately 20 minutes.4. Insert a fully charged battery, and turn on the camera.5. Depress the shutter button as you would to take a picture.Does the "ERR 99' message appear? If it does, then the camera should beserviced. If it does not, then please proceed to the next set of steps:1. Turn off the camera.2. Insert the CF card.3. Turn on the camera.4. Format the CF card in the camera.5. Depress the shutter button as you would to take a picture.Does the "ERR 99' message appear? If so, then the CF card is the mostlikely source of the issue. Try using a different card.If the message does not appear, please complete the following steps:1. Turn off the camera.2. Clean the lens contacts by gently rubbing them with a pencil eraseror soft cloth. Be careful that you do not let any debris fall into thecamera body.3. Reattach your lens.4. Turn on the camera.5. Depress the shutter button as you would to take a picture.If the "ERR 99' message only appears when one particular lens isattached, then that lens should be examined by a service technician.If you see the "ERR 99' with a different Canon lens attached, then thecamera should be serviced.

I AM SAGHA REPAIRER FROM MUMBAI I THINK THERE ARE PLENTY OF REASONS SHOWING ERR ON TOP DISPLAY BUT IF ERR IS SHOWING JUST BY TOUCHING THE SHUTTER RELEASE BUTTON THEN THE MAIN BOARD IS DEFECTIVE.IF ANY MECHANICAL ACTION OCCURS AFTER PRESSING SHUTTER RELEASE BUTTON AND THEN ERR APPEARS THEN THE FAULT COULD BE OF SHUTTER & APERTURE BLOCK.I THINK ALL THESE SOLUTIONS ARE FOR EXPERTS AND NOT FOR GENERAL USERS IF ANYBODY FINDS THEM USEFUL LET ME KNOW & ALL THESE ARE BASED ON MY OBSERVATION ABOUT FAULTY CAMERAS.

Err 99 usually means your lens contacts are dirty either on the lens itself or on the camera.

To isolate the cause of the issue, do the following: -1. Turn off the camera.2. Remove the lens, battery, and CF card.3. Allow the camera to sit without power for approximately 20 minutes.4. Insert only a fully charged battery, and turn on the camera.5. Depress the shutter button as you would to take a picture.

Does the “ERR 99" message appear? If so, the camera may be faulty and requires a service. If it does not, then: -1. Turn off the camera.2. Insert the CF card.3. Turn on the camera.4. Format the CF card in the camera.5. Depress the shutter button as you would to take a picture.

Does the “ERR 99" message appear? If so, then the CF card is faulty. Try a different card. If the message does not appear: -1. Turn off the camera.2. Clean the gold contacts on the lens by GENTLY rubbing them with a pencil eraser or soft cloth. Keeping the camera face pointing down, also clean the gold contacts on the camera, being careful that you do not let any debris fall into the camera body.3. Reattach your lens.4. Turn on the camera.5. Depress the shutter button as you would to take a picture.

If the “ERR 99" message only appears when one particular lens is attached, then that lens should be examined by a service technician.If you see the “ERR 99" with a different Canon lens attached, then the camera is faulty and should be serviced.

To isolate the cause of the issue, we suggest that you do the following:
1. Turn off the camera.2. Remove the lens, battery, and CF card.3. Allow the camera to sit without power for approximately 20 minutes.4. Insert a fully charged battery, and turn on the camera.5. Depress the shutter button as you would to take a picture.
Does the “ERR 99′ message appear? If it does, then the camera should beserviced. If it does not, then please proceed to the next set of steps:
1. Turn off the camera.2. Insert the CF card.3. Turn on the camera.4. Format the CF card in the camera.5. Depress the shutter button as you would to take a picture.
Does the “ERR 99′ message appear? If so, then the CF card is the mostlikely source of the issue. Try using a different card.
If the message does not appear, please complete the following steps:
1. Turn off the camera.2. Clean the lens contacts by gently rubbing them with a pencil eraseror soft cloth. Be careful that you do not let any debris fall into thecamera body.3. Reattach your lens.4. Turn on the camera.5. Depress the shutter button as you would to take a picture.
If the “ERR 99′ message only appears when one particular lens isattached, then that lens should be examined by a service technician.
If you see the “ERR 99′ with a different Canon lens attached, then thecamera should be serviced.

Let me know if this worked, if not then the camera is dead and it would require some service or a replacement

Although you may have cleaned the lens contacts, did you clean the camera contacts? This is a bit harder but it’s doable: just hold camera so lens opening
points down so no gunk falls in. Erase lightly. I used a lens cloth and
dabbed at the contacts rather than blow them so as not to blow the
erasings inside the camera.

1. Turn off the camera.
2. Remove the lens, battery, and CF card.
3. Allow the camera to sit without power for approximately 20 minutes.
4. Insert a fully charged battery, and turn on the camera.
5. Depress the shutter button as you would to take a picture.
Does the “ERR 99′ message appear? If it does, then the camera should be
serviced. If it does not, then please proceed to the next set of steps:
1. Turn off the camera.
2. Insert the CF card.
3. Turn on the camera.
4. Format the CF card in the camera.
5. Depress the shutter button as you would to take a picture.
Does the “ERR 99′ message appear? If so, then the CF card is the most
likely source of the issue. Try using a different card.
If the message does not appear, please complete the following steps:
1. Turn off the camera.
2. Clean the lens contacts by gently rubbing them with a pencil eraser
or soft cloth. Be careful that you do not let any debris fall into the
camera body.
3. Reattach your lens.
4. Turn on the camera.
5. Depress the shutter button as you would to take a picture.
If the “ERR 99′ message only appears when one particular lens is attached, then that lens should be examined by a service technician.
If you see the “ERR 99′ with a different Canon lens attached, then the camera should be serviced.